Andrew Holgate, judge and Sunday Times literary editor, said the choice of Howe was “unanimous”. “From the strongest of shortlists, they selected Loop of Jade by Sarah Howe as a work of astonishing originality, depth and scope,” he said, praising her “luminous” work.

“She is a writer always conscious of language. These are poems that are sensuous, subtle, and full of immediacy and resonance,” added Holgate.

Howe, who was born in Hong Kong to an English father and a Chinese mother, told the Guardian that she was astonished to win. “The three other books were so extraordinary that I was just enjoying being shortlisted,” she said.

Loop of Jade is her first collection, and was previously shortlisted for the TS Eliot prize, and for the Forward prize for best first collection. She spent 10 years writing it, and it has “quite a strong narrative strand running through it”.

“A lot of the poems are telling the story of my mother, who was an abandoned baby in China, almost certainly given up because she was a girl. That story is entwined with the story of my own childhood in Hong Kong,” she said. “It’s told quite elliptically and in fragments – poetry is good at that, and that’s the way the story was told to me. I heard about my mother’s story in fragments.”

Her mother, she added, is pleased about the success of Loop of Jade. “I think she’s really proud; we have glancing conversations about it, where I ask a question and she answers a different question. But she tells everyone about it.”

Stephen Hawking demonstrates Relativity for National Poetry Day

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For National Poetry Day this year, Howe’s poem Relativity was recorded by Stephen Hawking. “They say / a flash seen from on and off a hurtling train / will explain why time dilates like a perfect / afternoon,” he read, asking: “If we can think / this far, might not our eyes adjust to the dark?”

Novelist Sarah Waters, a former winner of the prize who joined Holgate along with Sunday Times chief fiction reviewer Peter Kemp on the judging panel, said that Howe was “a significant literary talent, a very special writer indeed”.